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Income Taxes (Tables)

12 Months Ended

Sep. 30, 2025

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

Table 11.1: Components of Provision for Income Taxes
			For the Year Ended September 30,
			2025						2024						2023
			(in thousands)
Current provision/(benefit):
Federal			$	96,446					$	82,875					$	34,033
State and local			31,245						26,951						12,332
Foreign			14,840						25,791						584
Total current provision for income taxes			142,531						135,617						46,949
Deferred tax expense/(benefit):
Federal			(11,499)						(16,347)						(1,495)
State and local			(3,861)						(5,447)						(673)
Foreign			(1,356)						(14,228)						3,720
Total deferred tax expense/(benefit)			(16,716)						(36,022)						1,552
Provision for income taxes			$	125,815					$	99,595					$	48,501

Schedule of Income before Income Tax, Domestic and Foreign

Table 11.2: Components of Income before Provision for Income Taxes by Jurisdiction
			For the Year Ended September 30,
			2025						2024						2023
			(in thousands)
Domestic			$	438,863					$	377,594					$	198,115
Foreign			5,986						28,915						12,178
Income before provision for income taxes			$	444,849					$	406,509					$	210,293

Schedule of Effective Income Tax Rate Reconciliation

Table 11.3: Reconciliation of Tax Expense at Statutory Rate to Actual Tax Expense
			For the Year Ended September 30,
			2025												2024												2023
			Amount						(1)						Amount						(1)						Amount						(1)
			(dollars in thousands)
Tax expense at statutory rate			$	93,418					21.0		%				$	85,367					21.0		%				$	44,162					21.0		%
Increase/(decrease) due to:
State income taxes, net of federal benefit			24,203						5.4		%				21,582						5.3		%				11,501						5.5		%
Foreign taxation rate differentials			80						—		%				875						0.2		%				(590)						(0.3)		%
Non-deductible expenses			4,147						0.9		%				2,444						0.6		%				2,889						1.4		%
Global intangible low taxed income			750						0.2		%				1,257						0.3		%				2,274						1.1		%
Valuation allowance - foreign jurisdictions			—						—		%				734						0.2		%				2,010						1.0		%
Tax credits			(6,384)						(1.4)		%				(8,997)						(2.2)		%				(6,645)						(3.2)		%
Divestiture-related charges			8,379						1.9		%				—						—		%				—						—		%
Excess tax expense/(benefits) from stock-based compensation			(1,546)						(0.3)		%				(1,656)						(0.4)		%				(1,399)						(0.7)		%
Other			2,768						0.6		%				(2,011)						(0.5)		%				(5,701)						(2.7)		%
Income tax expense			$	125,815					28.3		%				$	99,595					24.5		%				$	48,501					23.1		%

(1)Percentage of income before provision for income taxes.

Schedule of Deferred Tax Assets and Liabilities

Table 11.4: Components of Deferred Tax Assets and Liabilities
			As of September 30,
			2025						2024
			(in thousands)
Deferred tax assets/(liabilities):
Costs deductible in future periods			$	44,686					$	42,856
Deferred revenue			11,756						10,459
Stock compensation			10,363						7,482
Capital loss carryforward			204						7,872
Net operating loss carryforwards			8,128						35,492
Amortization of goodwill and intangibles			(176,438)						(183,406)
Capitalized software			(19,820)						(23,661)
Accounts receivable - unbilled			—						(4,731)
Property and equipment			28						1,286
Prepaid expenses			(13,946)						(11,696)
Financial instruments			(1,013)						(2,413)
Valuation allowance			(967)						(31,956)
Other			(510)						(1,901)
Net deferred tax liability			$	(137,529)					$	(154,317)

Our deferred tax assets and liabilities are held in various national and international jurisdictions and therefore may not be offset. Accordingly, our presentation of deferred taxes on our consolidated balance sheets is split between jurisdictions that show a net deferred tax asset and a net deferred tax liability.

Table 11.5: Deferred Tax Assets and Liabilities By Jurisdiction Positions
			As of September 30,
			2025						2024
			(in thousands)
Total of tax jurisdictions with net deferred tax assets			$	11,491					$	14,801
Total of tax jurisdictions with net deferred tax liabilities			(149,020)						(169,118)
Net deferred tax liabilities			$	(137,529)					$	(154,317)

Schedule of Unrecognized Tax Benefits Roll Forward

Table 11.6: Reconciliation of the Beginning and Ending Amounts of Potential Tax Benefits
			For the Year Ended September 30,
			2025						2024						2023
			(in thousands)
Balance at beginning of year			$	10,892					$	6,233					$	8,676
Decreases for lapse of statute of limitations			(300)						—						(2,051)
Decreases for settlements with taxing authorities			—						—						(692)
Increases for tax positions taken in current year			500						1,100						300
Increases for tax positions taken in prior year			4,841						6,148						—
Decreases for tax positions taken in prior year			(33)						(2,589)						—
Balance at end of year			$	15,900					$	10,892					$	6,233

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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